求解一道高数题,幂级数的,题在图中,第四个

1个回答

f(x) = 1/(2 - x) = 1/2 * 1/(1 - x/2)
= 1/2 * [ 1+ x/2 + (x/2)^2 + (x/2)^3 +……]
= 1/2 ∑(x/2)^n